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Knuth, The Art of Computer Programming, Vol. 3, Section 5.2.1, Problem 15.
Table of n, a(n) for n=0..21.
Sequence in context: A184598 A258460 A211831 * A101931 A220630 A041005
Adjacent sequences: A036970 A036971 A036972 * A036974 A036975 A036976
N. J. A. Sloane.